Improvement in tuck-markers



AQJoHNsToN;

l TUCK-MARKER.,

No. 184,472. Patented Nov.21,1e7e.

NITEE STATES PATENT OFFICE'.

ALLEN JOHNSTON, OE oTTUMwA, Town.

IMPROVEMENT IN TUCK-MARKERS.

Specification forming part of Letters Patent No. 184.472,dated November 2l, 1876; application filed August 17, 1876.

To all whom it may concern:

Beit known that I, ALLEN J oENsToN, of 0ttumwa, Iowa, have invented certain new and useful Improvements in Tuck-Marking Attachments for Sewing-Machines, of which the following is a specification:

My invention relates to that part of a tuckmarking attachment for sewing machines which, during the sewing of the folded tucks, marks on the goods the line of fold for the succeeding tuck. The devices by which the marking is ei'ected have usually heretofore consisted of a notch and a point or blade, between which the cloth passes, the mark or crease being made by the notch pressing upon the point or blade during the descent of the needle-bar.

In lieu of the notch and point or blade, I employ, in combination with the blade, a grooved wheel, operated by the descent of the needle-bar, to bear or press upon the goods, and having, when so operated, a to-and-fro movement over the stationary blade or edge. By thus rolling the creasing-wheel over the goods the cloth is more perfectly and readily marked than by the use of a point and notch, by which the goods, at each descent of the needle-bar, are struck but once and in one place. Under my invention, also, less pressure is required to make a crease than by striking with the notch and point, and hence the sewing-machine will run with more ease and more lightly.

The nature of my invention, and the manner in which the same is or may be carried into effect, will be understood by reference to the accompanying drawing, in whichy Figure 1 is a perspective view of a tuckmarker embodying myinvention. Figs. 2 and 3 are longitudinal vertical central sections of.

the marker proper in different positions.

My invention is applicable to tuck-marking attachments of various kinds.

The attachment shown in the drawing is one made under my Letters Patent N o. 170,375 of November 23, 1875, and No. 180,035 of July 18, 1876, more particularly the latter, in which will be found a full description of the attachment represented in the drawing, excepting, of course, that part of it in which my present invention is found. I shall therefore conne this specification to the part last referred toviz., the marker proper.

The blade or point a. of the marker is, as usual, affixed to the end of an adjustable bar, A, in a position parallel with the line of feed.

The blade is made a little longer than heretofore customary, for the purposes hereinafter mentioned. Above the blade is lthe creasingwheel b, provided in its periphery, as shown, with a groove or notch, which is located immediately above the blade, so that the latter will enter it when the wheel is depressed. The wheel revolves freely on a stud or arbor, c, suitably supported on the lower part of the spring-wheel-carrying frame, which consists of a bent spring-arm, B, the upper part of which is pivoted at e to uprights d, attached to the end of the spring-strip O, that is, as usual, fixed at its rear end to the adjustable markerbar A. The creasing-wheel-carryin g frame B can thus vibrate to some extent upon the pivots e as an axis. To prevent, however, the creasing-wheel from lifting away too far from the blade, or from having its adjustment disturbed relatively thereto, I form or provide the spring-strip C with an auxiliary strip, f, which extends below the lower part of the creasing-wheel frame, and is provided at its free end with a headed stud, g, which extends up through a slot, h, in the frame of sufficient length to allow requisite movement to the wheel. The head on the stud prevents the frame from unduly rising. The creasin g-wheel is shown in its normal position in Fig. 2. When, however, during the descent of the needle-bar, the extended upper arm of the spring-frame B is struck by the rod D, with which the needle-bar is connected in the usual way, the frame is tilted and compressed, as shown in Fig. 3, the creasing-wheel, by this movement, being pressed down on and drawn along over the blade. When the needle-bar rises, the spring-frame, in proportion as it is relieved from pressure, reassumes its normal position, and, in so doing, causes the creasingwheel to retrace its path over the blade rising therefrom as it returns to its first position.

The creasing-wheel thus is caused to work back and forth, as well as up and down, at each stroke of the needle-bar.

The wheel each time rolls farther than the length of the stitch, as ordinarily made, and thus creases moreof the cloth eajchjtime than is fed forward for the next stitch`.` Consequentis manifest, however, that the construction of the device may be varied considerably Without` departure from my invention. I do not limit myself, `therefore,to `the `particular mechanism herein shown and described in illustration of my improvements; but

What I claim, and desireto secure by Letters Patent, is

l. In a tuck-markingattachment for sewingmachines, the combination, substantiallyas set forth, witha stationaryblade `or edge, of a groove'd ornotched creasing-wheel, exercising, when in operation, a yielding pressure on the blade, and actuated at each descent of the needle to bear upon and at the same time move ,along upon the blade.

12.1lh'e combination,substantially as set forth, of the stationary marking blade or edge,

the creasing wheel, and the pivoted spring- 'frame `carrying the said Wheel. i

3. The pivoted spring-frame and the creasing-Wheel carried by the same, in combination with the iexible `or yieldingstrip supporting said frame, and the auxiliary strip,

connected with the frame by a slot-and-pin connection, substantially as and for the purposes set forth.

` `Intestimony whereof I have hereunto signed my name thistthday of August, A. D. 1876.

` ALLEN JOHNSTON. Attest: l W. T. MAJOR, A. G. HABROW. 

